scholarly journals Use of Sodium Silicate in Combination with Cement for Improving Peat Soil in Mekong River Delta - Vietnam

2021 ◽  
Vol 10 (4) ◽  
pp. 52-56
Author(s):  
Vũ Ngoc Binh ◽  
Do The Quynh
Keyword(s):  
Compressive Strength ◽  
Soil Sample ◽  
Sodium Silicate ◽  
Unconfined Compressive Strength ◽  
Peat Soil ◽  
Soil Samples ◽  
River Delta ◽  
Mekong River ◽  
Curing Time ◽  
Mekong River Delta

Peat soil is formed from river-bog sediments (abQ232) are largely distributed in Mekong river Delta provinces-Vietnam such as Kien Giang, Hau Giang, Bạc Liêu and Ca Mau. The resuls of research to improve them with many kinds of cements showed that the unconfined compressive strength of soil samples reinforced by cements had increased within 28 days, from 28 to 56 days this strength was reduced. Research for improving the soil above by cement and sodium silicate to increase the strength and stability with curing time had been conducted. The results showed that the concent of 0.5% of sodium silicate in comparison with cement mass was added to soil samples, their strength increased significantly when compared to soil samples without sodium silicate and greater than that of the soil samples reinforced by contents of 1%, 1.5% and 2% of sodium silicate in comparison with cement mass and also the concent of 0.5% of sodium silicate in comparison with cement mass added to soil sample has solved the problem of reducing soil sample strength with curing time.

scholarly journals Stabilizing Lateritic Soil Using Terrasil Solution

2017 ◽  
Vol 12 (1) ◽  
pp. 19-28
Author(s):  
Olumuyiwa S. Aderinola ◽  
Emeka S. Nnochiri
Keyword(s):  
Compressive Strength ◽  
Soil Sample ◽  
Unconfined Compressive Strength ◽  
Soil Samples ◽  
The Other ◽  
California Bearing Ratio ◽  
Lateritic Soil ◽  
Natural Soil ◽  
Engineering Property ◽  
Poor Soil

Abstract This study assesses stabilizing lateritic soil using Terrasil solution. Preliminary tests were carried out on six natural soil samples from three borrow pit locations-two soil samples from a particular borrow pit location, for the purpose of identification and classification. Soil samples 1 and 2 from borrow pit 3 were found to be poor, hence, needed stabilization. While the other four samples from borrow pits 1 and 2 were found to be good enough. Engineering property tests such as California Bearing Ratio (CBR), Unconfined Compressive Strength (UCS) and Compaction tests were performed on both the natural soil samples and the stabilized lateritic soil samples which were stabilized by adding terrasil solution in percentages ranging from 0% to 16% at 2% interval. The results showed that the addition of terrasil solution enhanced the strength of the two soil samples from borrow pit 3. For soil sample 1, the unsoaked CBR values increased from 8.4% at 0% to optimum value of 30.3% at 12% terrasil solution, while for soil sample 2, the unsoaked CBR values increased from 6.2% to optimum value of 32.0% at 12% terrasil solution. It was therefore concluded that the terrasil solution serves as a cheap and effective stabilizing agent for poor soil.

scholarly journals Isolation and evaluation of the ability to decompose sugarcane leaves of bacterial strains from acid sulfate soils in the Mekong River Delta

2021 ◽  
Vol 63 (3) ◽  
pp. 24-27
Author(s):  
Van Long Vu ◽  
◽  
Van Dung Tran ◽  
Keyword(s):  
Soil Samples ◽  
River Delta ◽  
Mekong River ◽  
Acid Sulfate Soils ◽  
Bacterial Strains ◽  
Acid Sulfate ◽  
Mekong River Delta ◽  
Cellulase Enzyme ◽  
Sulfate Soils

The objectives of this study were to isolate and determine the ability of bacterial strains to decompose sugarcane leaves from acid sulfate soils in the Mekong River Delta (MRD). Soil samples were collected from three acid sulfate soils in Ben Luc district, Long An province, Phung Hiep district, Hau Giang province, and Hon Dat district, Kien Giang province where large sugarcane areas cultivated. Six soil samples were collected and coded: LA1, LA2, HG1, HG2, KG1, and KG2. The results of the study have isolated 18 strains of bacteria are capable of producing cellulase enzyme that breaks down cellulose including LA2-4b, LA2-1, LA2-4a, LA2-2, KG2-1, KG2-2a, KG2-2b, KG2-3, KG2-20, KG2-21, KG2-22, KG2-24, KG2-26, KG2-27, LA1-1, LA1-2, LA1-3, LA1-7. All isolated bacterial strains have the ability to effectively decompose sugarcane leaves, have the potential to apply in practical production, and contribute to improving the quality of acid sulfate soils in the MRD. In which, five selected bacterial strains (LA1-1, LA2-4a, LA2-4b, KG2-2b, and KG2-24) were significantly higher (p<0.05) in the decomposition of sugarcane leaves than the treatment without bacteria.

Climate change impacts on rice productivity in the Mekong River Delta

2019 ◽  
Vol 102 ◽  
pp. 71-83 ◽  
Author(s):  
Caitlin Kontgis ◽  
Annemarie Schneider ◽  
Mutlu Ozdogan ◽  
Christopher Kucharik ◽  
Van Pham Dang Tri ◽  
...  
Keyword(s):  
Climate Change ◽  
Climate Change Impacts ◽  
River Delta ◽  
Mekong River ◽  
Mekong River Delta ◽  
Rice Productivity

Experimental study on strength of cement stabilized clay

2005 ◽  
Vol 3 (2) ◽  
pp. 116-126 ◽  
Author(s):  
Woo‐Sik Kim ◽  
Nguyen Minh Tam ◽  
Du‐Hwoe Jung
Keyword(s):  
Compressive Strength ◽  
Soil Type ◽  
Unconfined Compressive Strength ◽  
Weight Ratio ◽  
Dry Weight ◽  
Strength Characteristics ◽  
Curing Time ◽  
Compression Tests ◽  
Soil Cement ◽  
Mixing Method

This paper describes the effect of factors on the strength characteristics of cement treated clay from laboratory tests performed on cement mixed clay specimens. It is considered that several factors such as soil type, sample preparing method, quantity of binder, curing time, etc. can have an effect on strength characteristics of cement stabilized clay. A series of unconfined compression tests have been performed on samples prepared with different conditions. The results indicated that soil type, mixing method, curing time, dry weight ratio of cement to clay (Aw), and water‐clay to cement (wc/c) ratio were main factors which can have an influence on unconfined compressive strength, modulus of elasticity, and failure strain of cement stabilized clay. Unconfined compressive strength of soil‐cement samples prepared from dry mixing method was higher than those prepared from wet mixing method.

scholarly journals Temporal Fluctuation of Multidrug Resistant Salmonella Typhi Haplotypes in the Mekong River Delta Region of Vietnam

2011 ◽  
Vol 5 (1) ◽  
pp. e929 ◽  
Author(s):  
Kathryn E. Holt ◽  
Christiane Dolecek ◽  
Tran Thuy Chau ◽  
Pham Thanh Duy ◽  
Tran Thi Phi La ◽  
...  
Keyword(s):  
Salmonella Typhi ◽  
Multidrug Resistant ◽  
River Delta ◽  
Mekong River ◽  
Temporal Fluctuation ◽  
Delta Region ◽  
Mekong River Delta
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